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Back-to-back type non-electrolytic capacitor frequency conversion speed regulation system and method

A frequency conversion speed regulation, electrolytic capacitor technology, applied in the control system, electrical components, AC motor control and other directions, can solve the problem that the power adjustment of the inverter circuit cannot fully meet the current control requirements of the grid, to suppress the voltage harmonic content, realize the Dynamic balance and decoupling control, the effect of improving power factor

Active Publication Date: 2020-08-07
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

The disadvantage of this topology is that the control of the grid current can only be realized indirectly through the power regulation of the rear stage inverter circuit, but due to the unidirectional working characteristics of the rectifier diode and the power limitation of the inverter circuit, the power regulation of the inverter circuit cannot be fully adjusted. Satisfy the demand for control of grid current

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  • Back-to-back type non-electrolytic capacitor frequency conversion speed regulation system and method
  • Back-to-back type non-electrolytic capacitor frequency conversion speed regulation system and method
  • Back-to-back type non-electrolytic capacitor frequency conversion speed regulation system and method

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Embodiment Construction

[0034] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] The present invention proposes a back-to-back non-electrolytic capacitor frequency conversion speed regulation system, including: a rectification link, a DC bus link and an inverter link, and a PTC controller that performs power tracking on both sides of the DC bus to achieve power balance. The link and the inverter link are respectively located on both sides of the DC bus link, and the rectification link includes a small-capacity film capacitor for absorbing high-frequency ripple.

[0036] The invention improves the traditional rectification and inverter control method, proposes the concept and structure of power integration, and proposes a power controller. The power balance on both sides of the DC bus is achieved through power tracking, so as to realize the rapid response to the flowing energy and reduce the...

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Abstract

The invention relates to a back-to-back type variable-frequency speed control system without an electrolytic capacitor and a back-to-back type variable-frequency speed control method without the electrolytic capacitor, and the system comprises a rectification link, a direct current bus link, an inversion link, and a PTC for performing power tracking for two sides of a direct current bus to realizepower balance, wherein the rectification link and the inversion link are respectively located at two sides of the direct current bus link, and the rectification link comprises a small-capacity thin film capacitor used for absorbing high frequency ripples. Aiming at a problem of system instability caused by intense coupling of a rectification side and an inversion side, an integrated power controlstrategy and a new power tracking controller are provided in the invention, thus, energy stress of the direct current bus thin film capacitor is reduced, and dynamic balance and decoupling control ofpower are realized. Direct current side voltage harmonic content can be restrained, waveform quality of an input current of a power grid side can be improved effectively, and a power factor is improved.

Description

technical field [0001] The invention relates to the field of power electronics technology, in particular to a back-to-back electrolytic capacitor-free frequency conversion speed regulation system and method based on PTC power integrated control in rectification and inverter control. Background technique [0002] The early frequency converter refers to the traditional AC-AC frequency converter ( diagram 2-1 As shown), since no DC link is required, there is no filter electrolytic capacitor in the system, and the input AC voltage is converted into an output voltage with variable frequency by continuous alternating phase modulation of the firing angle of the thyristor to achieve the purpose of frequency conversion . Due to the use of semi-controlled devices, the system using this structure is difficult to achieve more complex control, and cannot output voltage higher than the input power frequency, and the input power factor is low. It is generally suitable for low-speed drives...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M1/14H02P27/06
CPCH02M1/14H02M5/4585H02P27/06
Inventor 王毅鲍丹阳卢俊龙王崧达李可
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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